Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1997-09-16
Thin Solid Films, 327-329 (1998) 681
Physics
Condensed Matter
Soft Condensed Matter
9 pages, LaTeX2e article, 8 figures, 11 EPS files, submitted to Thin Solid Films
Scientific paper
10.1016/S0040-6090(98)00740-8
Mono-layers of stearic and behenic acids and mixtures of them in different proportions, deposited with the Langmuir-Blodgett technique, were used to study the alignment and the alignment dynamics in nematic liquid crystal cells. A relaxation process from a splay-bend flow induced metastable orientation to the homeotropic one occurs. The lifetime of the metastable state was found to depend on the mono-layer composition. The transition between the homeotropic and the conical anchoring was found to be irreversible in the case of the mixed aligning mono-layers: on cooling from the isotropic phase a quasi-planar nematic state (schlieren texture) appears. It is stable in a range of a few degrees below the clearing point and, on decreasing the temperature, relaxes to the homeotropic state in form of expanding domains.
Fazio Valentina S. U.
Komitov Lachezar
Lagerwall Sven T.
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